地震荷载对复合桩加固液化土地基的影响分析

Impact Analysis of Liquefiable Sand Soil Improved by Composite Piles under Seismic Loading

通过复合桩体加固液化土地基模型的振动台试验,再现地震作用下不同加固形式对液化土的影响。依据孔隙水压力与土压力时程曲线,分析了孔隙水压力与土压力峰值和最终稳定值,揭示了碎石桩参与的复合桩能加速土体排水,提高了土体的抗液化和固结效果,水泥土长短复合桩的隔栅作用,能够抑制中、浅层土体液化,对于深层土体效果不明显。该研究为实际工程选用抗液化方式提供一定参考。

Through the shaking table model test of pile body reinforced liquefiable sand,the influence of different reinforcement forms on liquefiable soil under the earthquake was simulated.Based on the time profile of pore water pressurerth pressure,the peak value and final stable value of the pore water pressure and earth pressure were analyzed,the accelerated soil drainage of the compound pile involved gravel pile was revealeds which improved soil＇s resistance against liquefaction and consolidation effect.The grille of the long-short cement pile can restrain the shallow and middle soil to liquefy,but the effect was it is not clear for the deep soil.The paper provides certain reference for the practical project to select the anti-liquefaction.